PCI Express Boards
Device Side Pin Assignments—Male DB9
PIN
RS-232
1
DCD
2
RxD
3
TxD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
Male DB25 (CBL-M78M25x8-100)
PIN
RS-232
2
TxD
3
RxD
4
RTS
5
CTS
6
DSR
7
GND
8
DCD
20
DTR
RS-422/RS-485-4W
RS-485-2W
TxD-(A)
–
TxD+(B)
–
RxD+(B)
Data+(B)
RxD-(A)
Data-(A)
GND
GND
–
–
–
–
–
–
RS-422/RS-485-4W
RxD+(B)
TxD+(B)
–
–
–
GND
TxD-(A)
RxD-(A)
RS-485-2W
Data+(B)
–
–
–
–
GND
–
Data-(A)
6-14
Pin Assignments
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